JP2567147B2 - Rewinder control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a rewinder control device.

(Prior Art) FIG. 2 shows a conventional rewinder control device. This rewinder control device is used in rewinder equipment for winding the sheet material 1 wound on the unwinder 2 on the winding roll 3 via the intermediate roll 6, and includes control circuits 20, 30 and 40. The unwinder 2 is driven by the electric motor 8, and the winding roll 3 is driven by the rear drum 4 and the front drum 5. The rear drum 4 and the front drum 5 are driven by electric motors 10 and 11, respectively, and the intermediate roll 6 is driven by an electric motor 9. A tension detecting roll 7 for detecting the tension of the sheet material 1 is provided between the intermediate roll 6 and the winding roll 3. Then, based on the signal from the tension detecting roll 7, the tension detector 60 detects the tension T acting on the sheet material 1.

The control circuit 20 includes a tension reference setting device 21 and an inertia compensation circuit 22.
And an adder 23, a tension controller 24, a current controller 25, and a power converter 26, and controls the electric motor 8. In the control circuit 20, the deviation between the tension reference of the sheet material 1 set by the tension reference setting device 21 and the detected value of the tension T detected by the tension detector 60, that is, the tension deviation is obtained by the adder 23. . On the other hand, a tension error due to the inertia of the unwinder 2 itself is obtained by the inertia compensation circuit 22. Then, the tension control unit 24 outputs a current control signal that causes the deviation between the tension error and the output of the adder 23 to be zero, and the current control unit 25 outputs the current control signal based on the current control signal.
The electric motor 8 is controlled by the electric power converter 26.

On the other hand, the control circuit 30 includes a speed reference signal generation circuit 31, an adder 32, a speed controller 33, current controllers 34 and 36, and power converters 35 and 37, and the electric motors 10 and 11 are provided. To control. In the control circuit 30, the speed reference signal generating circuit 31 outputs the reference of the winding speed of the rear drum 4 and the front drum 5, that is, the speed reference of the winding roll 3, based on a predetermined speed pattern. Then, the speed deviation between the winding speed reference and the rotation speed of the electric motor 10 detected by the speed detector 70 is calculated in the adder 32, and a current control signal that makes this speed deviation zero is output from the speed controller 33. Is output. Then, based on this current control signal, the electric current controller 34 controls the electric motor 10 via the power converter 35, and based on the control command, the electric current controller 36 controls the electric motor 11 via the electric power converter 37. To be done. As a result, the sheet material 1 is wound at a constant speed.

The control circuit 50 also includes a drooping amount setting device 51 and adders 52 and 53.
The speed controller 54, the current controller 55, and the power converter 56 are provided to control the speed of the electric motor 9 that drives the intermediate roll 6. In the control circuit 50, the difference between the output of the speed reference signal generating circuit 31 and the output of the drooping amount setting device 51, that is, the speed reference of the intermediate roll 6 is calculated by the adder 52. Then, the speed deviation between this speed reference and the actual speed of the electric motor 9 detected by the speed detector 80 is calculated in the adder 53. Then, a current control signal that makes the calculated speed deviation zero is output from the speed controller 54, and the current controller 55 controls the electric motor 9 via the power converter 56 based on the current control signal. Here, the drooping amount setting device 51 divides the output signal of the speed controller 54 to perform an appropriate level conversion, and the output signal of the speed controller 54, that is, according to the increase of the load of the intermediate roll. , And acts to reduce the speed reference of the intermediate roll 6. Therefore, the drooping amount setting device 51 realizes the drooping characteristic of the electric motor 9. The purpose of realizing this drooping characteristic is to adjust the speed of the intermediate roll 6 when there is a speed difference between the intermediate roll 6 and the sheet material 1. For example, the speed of the intermediate roll 6 is the conveyance speed of the sheet material 1. Motor 9 if faster than speed
Therefore, the speed reference of the intermediate roll 6 is lowered to control so as to balance with the speed of the sheet material 1.

(Problem to be Solved by the Invention) In such a conventional rewinder control device, there is a problem that the tension fluctuation is large when the winding roll 3 is accelerated or decelerated. This will be described below.

If there is a speed difference between the intermediate roll 6 and the take-up roll 3, the tension of the sheet material 1 varies. Assuming that the speed difference between the intermediate roll 6 and the take-up roll 3 is Δv and the Young's modulus of the sheet material 1 is Y, the tension error ΔT per unit width generated in the sheet material 1 due to the speed difference is ΔT = Y · ∫Δvdt (1 ), There is a difference of ΔT between the unwinder tension T ₁ and the winder tension T ₂ . There is no problem while ΔT is small, but when ΔT becomes larger than the frictional force, the intermediate roll 6 and the sheet material 1 start to slide. The tension error ΔT ′ at this time is ΔT ′ = Δv ′ ·, where Δv ′ is the speed difference between the intermediate roll 6 and the sheet material 1, μ is the dynamic friction coefficient, and A is the area where the sheet material 1 is in contact with the intermediate roll 6. μ · A (2)

On the other hand, the speeds of the intermediate roll 6 and the take-up roll 3 have a difference due to a control error and a difference in speed response. Especially during acceleration / deceleration, the difference in speed becomes large due to the difference in speed response. The open loop open loop transfer function G of the speed control system of the winding roll 3 is Is represented. Here, S is the Laplace operator, K is the gain constant, T ₁ is the time constant of the speed control amplifier 54, T ₂ is the time constant of the current control system, J is the winding roll 3, and the rotation that drives this winding roll 3. It is the total moment of inertia of the system. The moment of inertia of the take-up roll 3 increases as the roll diameter increases. For this reason, the gain of the open loop transfer function of equation (3) decreases as the roll diameter increases, and the velocity response becomes slow. Since the moment of inertia of the winding roll 3 also changes depending on the density and width of the sheet material 1, the speed response also changes depending on the type of the sheet material 1. On the other hand, since the moment of inertia of the intermediate roll 6 is always constant,
The velocity response does not change. Therefore, the speed response of the intermediate roll 6 and the take-up roll 3 is different due to the difference in coil diameter or the kind of the take-up roll 3, and when the speed reference is changed, there is a difference in the time required to reach the target speed. Occurs, and a speed difference occurs between the intermediate roll 6 and the take-up roll 3. Then, when a speed difference occurs, the tension error increases according to the equation (1), and when the maximum point is reached and the friction force is exceeded, the roll 6 and the sheet material 1 begin to slip, and the tension error is the value according to the equation (2). Go down to. Therefore, it is important to reduce the tension error in the region of Expression (1).

In the conventional rewinder control device, when a speed difference occurs between the intermediate roll 6 and the take-up roll 3, a tension error occurs according to the equation (1), and the load on the intermediate roll increases or decreases by this amount. As the load is increased or decreased, the current control signal output from the speed controller 54 is increased or decreased. Therefore, the speed of the intermediate roll 6 is adjusted by adjusting the amount of droop by the increase or decrease of the current control signal. It is intended to compensate for the speed of the winding roll 3. However, as can be seen from the equation (1), the tension error is the integral value of the speed difference, and therefore the level of the speed difference varies depending on the process situation even with the same tension error. Also, since the Young's modulus differs depending on the type of sheet material 1, the relationship between the tension error and the speed difference is not constant. That is, since the optimum value of the drooping amount depends on the process conditions, even if the drooping amount is adjusted under certain conditions in the past, if the conditions change, it will deviate from the optimum value and the tension fluctuation will increase. .

The present invention has been made in consideration of the above problems, and provides a rewinder control device that does not depend on process conditions and can suppress tension fluctuation due to the influence of an intermediate roll as much as possible. With the goal.

[Structure of Invention]

(Means for Solving the Problem) A rewinder control device according to the present invention drives a take-up roll by a rear drum and a front drum to move a sheet material wound around an unwinder to the take-up roll via an intermediate roll. In the rewinding equipment for winding, tension control means for controlling the tension of the sheet material via an electric motor that drives the unwinder so that the tension of the sheet material becomes a predetermined value, and driving the rear drum and the front drum so that the speed of the winding roll serves as a speed reference. Speed control means for controlling via an electric motor, acceleration / deceleration torque calculation means for calculating the acceleration / deceleration torque of the intermediate roll based on the speed reference, and mechanical loss torque calculation means for calculating the mechanical loss torque of the intermediate roll based on the speed reference. And the torque of the motor that drives the intermediate roll is the acceleration / deceleration torque and the mechanical loss torque. And a torque control unit for controlling the sum of the above.

(Operation) According to the rewinder control device of the present invention configured as described above, the torque control is performed such that the torque of the electric motor driving the intermediate roll is the sum of the calculated acceleration / deceleration torque of the intermediate roll and the mechanical loss torque. Controlled by means. Accordingly, the sheet material can be rewound without affecting the traveling of the sheet material, and the fluctuation in tension can be suppressed as much as possible.

(Embodiment) FIG. 1 shows the configuration of an embodiment of the rewinder control device according to the present invention. The rewinder control device of this embodiment is
In the conventional rewinder controller shown in FIG. 2, a control circuit 40 is provided instead of the control circuit 50 for controlling the electric motor 9 for driving the intermediate roll 6. This control circuit 40
Has an acceleration / deceleration torque calculation circuit 41, a mechanical loss torque calculation circuit 42, an adder 43, a current controller 44, and a power converter 45. The acceleration / deceleration torque calculation circuit 41 differentiates the speed reference signal of the winding roll 3, which is the output of the speed reference signal generation circuit 31, and multiplies the differentiated value by the moment of inertia of the intermediate roll 6 to add the intermediate roll 6 Calculate deceleration torque. The mechanical loss torque calculation circuit 42 is provided with, for example, a function generator because the mechanical loss of the intermediate roll 6 is generally a function of the roll speed, so that the speed reference signal of the take-up roll 3 which is the output of the speed reference signal generation circuit 31 is provided. The mechanical loss torque of the intermediate roll 6 is calculated based on Then, the acceleration / deceleration torque of the intermediate roll 6 and the mechanical loss torque calculated in this way are added in the adder 43, and the sum, that is, the compensation torque is sent to the current controller 44. Then, the electric current controller 44 controls the electric motor 9 via the power converter 45 so that the drive torque of the intermediate roll 6 becomes the calculated compensation torque.

The electric motor 8 for driving the unwinder 2 is controlled by the control circuit 20 as in the conventional device, and the rear drum 4
The electric motors 10 and 11 for driving the front drum 5 are controlled by the control circuit 30 as in the conventional device.

Since the intermediate roll 6 is driven by the acceleration / deceleration (inertia) torque and the mechanical loss torque of the intermediate roll 6 as described above, the traveling of the sheet material 1 is not affected.
The tension fluctuation can be reduced by the rewinder control device of the present embodiment. Further, regarding the adjustment, in the conventional control device, the sheet material 1 is passed through, accelerated and decelerated to adjust the hanging amount of the intermediate roll 6. Also, since the adjustment value differs depending on the coil diameter of the winding roll 3 and the material of the sheet material 1, various winding rolls must be placed and the above adjustments must be repeated to squeeze the optimum value, which is very troublesome. , Required skill. However, according to the present embodiment, the intermediate roll 6 can be adjusted independently by accelerating and decelerating without passing through the sheet material 1, so that the adjustment can be performed accurately and easily without depending on the process conditions.

〔The invention's effect〕

As described above, according to the present invention, since the intermediate roll is driven by the compensating torque that is the sum of the inertia torque and the mechanical loss torque, the traveling of the sheet material is not affected. It is possible to suppress the tension fluctuation that has occurred due to the speed difference of the take-up roll as much as possible without depending on the process conditions.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a rewinder control device according to the present invention, and FIG. 2 is a block diagram showing a configuration of a conventional rewinder control device. 1 ... Sheet material, 2 ... Unwinder, 3 ... Winding roll, 4 ... Rear drum, 5 ... Front drum, 6 ...
Intermediate roll, 8,9,10,11 …… Motor, 20,30 …… Control circuit, 21 …… Tension reference setting device, 22 …… Inertia compensation circuit, 24…
… Tension controller, 25,34,36,44 …… Current controller, 26,35,37,
45 …… power converter, 31 …… speed reference signal generation circuit, 41…
… Acceleration / deceleration torque calculation circuit, 42 …… Mechanical loss torque calculation circuit, 60 …… Tension detector, 70 …… Speed detector.

Claims (1)

(57) [Claims] 1. A rewinder facility for winding a sheet material wound around an unwinder onto an intermediate winding roll by driving the winding roll by a rear drum and a front drum. Tension control means for controlling via a motor for driving the unwinder to a predetermined value, and speed for controlling via a motor for driving the rear drum and the front drum so that the speed of the winding roll serves as a speed reference. Control means, acceleration / deceleration torque calculation means for calculating the acceleration / deceleration torque of the intermediate roll based on the speed reference, mechanical loss torque calculation means for calculating the mechanical loss torque of the intermediate roll based on the speed reference, the intermediate The torque of the motor driving the roll is the sum of the acceleration / deceleration torque and the mechanical loss torque. Rewinder control apparatus characterized by and a torque control means for controlling the so that.